darshan-mpiio.c 45.4 KB
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/*
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 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
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 */

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#define _XOPEN_SOURCE 500
#define _GNU_SOURCE

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#include "darshan-runtime-config.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <search.h>
#include <assert.h>
#include <pthread.h>

#include "darshan.h"
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#include "darshan-dynamic.h"
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/* The mpiio_file_record_ref structure maintains necessary runtime metadata
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 * for the MPIIO file record (darshan_mpiio_file structure, defined in
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 * darshan-mpiio-log-format.h) pointed to by 'file_rec'. This metadata
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 * assists with the instrumenting of specific statistics in the file record.
 *
 * RATIONALE: the MPIIO module needs to track some stateful, volatile 
 * information about each open file (like the current file offset, most recent 
 * access time, etc.) to aid in instrumentation, but this information can't be
 * stored in the darshan_mpiio_file struct because we don't want it to appear in
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 * the final darshan log file.  We therefore associate a mpiio_file_record_ref
 * struct with each darshan_mpiio_file struct in order to track this information
 * (i.e., the mapping between mpiio_file_record_ref structs to darshan_mpiio_file
 * structs is one-to-one).
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 *
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 * NOTE: we use the 'darshan_record_ref' interface (in darshan-common) to
 * associate different types of handles with this mpiio_file_record_ref struct.
 * This allows us to index this struct (and the underlying file record) by using
 * either the corresponding Darshan record identifier (derived from the filename)
 * or by a generated MPI file handle, for instance. So, while there should only
 * be a single Darshan record identifier that indexes a mpiio_file_record_ref,
 * there could be multiple open file handles that index it.
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 */
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struct mpiio_file_record_ref
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{
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    struct darshan_mpiio_file *file_rec;
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    enum darshan_io_type last_io_type;
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    double last_meta_end;
    double last_read_end;
    double last_write_end;
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    void *access_root;
    int access_count;
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};

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/* The mpiio_runtime structure maintains necessary state for storing
 * MPI-IO file records and for coordinating with darshan-core at 
 * shutdown time.
 */
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struct mpiio_runtime
{
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    void *rec_id_hash;
    void *fh_hash;
    int file_rec_count;
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};

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static void mpiio_runtime_initialize(
    void);
static struct mpiio_file_record_ref *mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path);
static void mpiio_finalize_file_records(
    void *rec_ref_p);
static void mpiio_record_reduction_op(
    void* infile_v, void* inoutfile_v, int *len, MPI_Datatype *datatype);
static void mpiio_shared_record_variance(
    MPI_Comm mod_comm, struct darshan_mpiio_file *inrec_array,
    struct darshan_mpiio_file *outrec_array, int shared_rec_count);
static void mpiio_cleanup_runtime(
    void);

static void mpiio_shutdown(
    MPI_Comm mod_comm, darshan_record_id *shared_recs,
    int shared_rec_count, void **mpiio_buf, int *mpiio_buf_sz);

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/* DXLT */
extern void dxlt_mpiio_runtime_initialize();
extern void dxlt_mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path);
extern void dxlt_mpiio_add_record_ref(
    darshan_record_id rec_id, MPI_File fh);
extern void dxlt_mpiio_write(MPI_File fh, int64_t length,
    double start_time, double end_time);
extern void dxlt_mpiio_read(MPI_File fh, int64_t length,
    double start_time, double end_time);

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static struct mpiio_runtime *mpiio_runtime = NULL;
static pthread_mutex_t mpiio_runtime_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
static int instrumentation_disabled = 0;
static int my_rank = -1;

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#define MPIIO_LOCK() pthread_mutex_lock(&mpiio_runtime_mutex)
#define MPIIO_UNLOCK() pthread_mutex_unlock(&mpiio_runtime_mutex)

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#define MPIIO_PRE_RECORD() do { \
    MPIIO_LOCK(); \
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    if(!instrumentation_disabled) { \
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        if(!mpiio_runtime) { \
            mpiio_runtime_initialize(); \
            /* DXLT */ \
            if (getenv("ENABLE_DXLT_IO_TRACE")) { \
                dxlt_mpiio_runtime_initialize(); \
            } \
        } \
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        if(mpiio_runtime) break; \
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    } \
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    MPIIO_UNLOCK(); \
    return(ret); \
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} while(0)

#define MPIIO_POST_RECORD() do { \
    MPIIO_UNLOCK(); \
} while(0)

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#define MPIIO_RECORD_OPEN(__ret, __path, __fh, __comm, __mode, __info, __tm1, __tm2) do { \
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    darshan_record_id rec_id; \
    struct mpiio_file_record_ref *rec_ref; \
    char *newpath; \
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    int comm_size; \
    if(__ret != MPI_SUCCESS) break; \
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    newpath = darshan_clean_file_path(__path); \
    if(!newpath) newpath = (char *)__path; \
    if(darshan_core_excluded_path(newpath)) { \
        if(newpath != __path) free(newpath); \
        break; \
    } \
    rec_id = darshan_core_gen_record_id(newpath); \
    rec_ref = darshan_lookup_record_ref(mpiio_runtime->rec_id_hash, &rec_id, sizeof(darshan_record_id)); \
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    if(!rec_ref) { \
        rec_ref = mpiio_track_new_file_record(rec_id, newpath); \
        /* DXLT */ \
        if (getenv("ENABLE_DXLT_IO_TRACE")) { \
            dxlt_mpiio_track_new_file_record(rec_id, newpath); \
        } \
    } \
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    if(!rec_ref) { \
        if(newpath != __path) free(newpath); \
        break; \
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    } \
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    rec_ref->file_rec->counters[MPIIO_MODE] = __mode; \
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    DARSHAN_MPI_CALL(PMPI_Comm_size)(__comm, &comm_size); \
    if(comm_size == 1) \
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        rec_ref->file_rec->counters[MPIIO_INDEP_OPENS] += 1; \
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    else \
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        rec_ref->file_rec->counters[MPIIO_COLL_OPENS] += 1; \
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    if(__info != MPI_INFO_NULL) \
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        rec_ref->file_rec->counters[MPIIO_HINTS] += 1; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] > __tm1) \
        rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] = __tm1; \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_META_TIME], \
        __tm1, __tm2, rec_ref->last_meta_end); \
    darshan_add_record_ref(&(mpiio_runtime->fh_hash), &__fh, sizeof(MPI_File), rec_ref); \
    if(newpath != __path) free(newpath); \
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    /* DXLT */ \
    if (getenv("ENABLE_DXLT_IO_TRACE")) { \
        dxlt_mpiio_add_record_ref(rec_id, __fh); \
    } \
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} while(0)

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#define MPIIO_RECORD_READ(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
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    struct mpiio_file_record_ref *rec_ref; \
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    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
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    if(__ret != MPI_SUCCESS) break; \
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    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash, &(__fh), sizeof(MPI_File)); \
    if(!rec_ref) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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    /* DXLT to record detailed read tracing information */ \
    if (getenv("ENABLE_DXLT_IO_TRACE")) { \
        dxlt_mpiio_read(__fh, size, __tm1, __tm2); \
    } \
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    DARSHAN_BUCKET_INC(&(rec_ref->file_rec->counters[MPIIO_SIZE_READ_AGG_0_100]), size); \
    darshan_common_val_counter(&rec_ref->access_root, &rec_ref->access_count, size, \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_ACCESS]), \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_COUNT])); \
    rec_ref->file_rec->counters[MPIIO_BYTES_READ] += size; \
    rec_ref->file_rec->counters[__counter] += 1; \
    if(rec_ref->last_io_type == DARSHAN_IO_WRITE) \
        rec_ref->file_rec->counters[MPIIO_RW_SWITCHES] += 1; \
    rec_ref->last_io_type = DARSHAN_IO_READ; \
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    if(rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] = __tm1; \
    rec_ref->file_rec->fcounters[MPIIO_F_READ_END_TIMESTAMP] = __tm2; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_MAX_READ_TIME] < __elapsed) { \
        rec_ref->file_rec->fcounters[MPIIO_F_MAX_READ_TIME] = __elapsed; \
        rec_ref->file_rec->counters[MPIIO_MAX_READ_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_READ_TIME], \
        __tm1, __tm2, rec_ref->last_read_end); \
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} while(0)
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#define MPIIO_RECORD_WRITE(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
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    struct mpiio_file_record_ref *rec_ref; \
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    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
    if(__ret != MPI_SUCCESS) break; \
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    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash, &(__fh), sizeof(MPI_File)); \
    if(!rec_ref) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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     /* DXLT to record detailed write tracing information */ \
    if (getenv("ENABLE_DXLT_IO_TRACE")) { \
        dxlt_mpiio_write(__fh, size, __tm1, __tm2); \
    } \
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    DARSHAN_BUCKET_INC(&(rec_ref->file_rec->counters[MPIIO_SIZE_WRITE_AGG_0_100]), size); \
    darshan_common_val_counter(&rec_ref->access_root, &rec_ref->access_count, size, \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_ACCESS]), \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_COUNT])); \
    rec_ref->file_rec->counters[MPIIO_BYTES_WRITTEN] += size; \
    rec_ref->file_rec->counters[__counter] += 1; \
    if(rec_ref->last_io_type == DARSHAN_IO_READ) \
        rec_ref->file_rec->counters[MPIIO_RW_SWITCHES] += 1; \
    rec_ref->last_io_type = DARSHAN_IO_WRITE; \
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    if(rec_ref->file_rec->fcounters[MPIIO_F_WRITE_START_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        rec_ref->file_rec->fcounters[MPIIO_F_WRITE_START_TIMESTAMP] = __tm1; \
    rec_ref->file_rec->fcounters[MPIIO_F_WRITE_END_TIMESTAMP] = __tm2; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_MAX_WRITE_TIME] < __elapsed) { \
        rec_ref->file_rec->fcounters[MPIIO_F_MAX_WRITE_TIME] = __elapsed; \
        rec_ref->file_rec->counters[MPIIO_MAX_WRITE_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME], \
        __tm1, __tm2, rec_ref->last_write_end); \
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} while(0)

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/**********************************************************
 *        Wrappers for MPI-IO functions of interest       * 
 **********************************************************/
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#ifdef HAVE_MPIIO_CONST
int MPI_File_open(MPI_Comm comm, const char *filename, int amode, MPI_Info info, MPI_File *fh) 
#else
int MPI_File_open(MPI_Comm comm, char *filename, int amode, MPI_Info info, MPI_File *fh) 
#endif
{
    int ret;
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    MPI_File tmp_fh;
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    char* tmp;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_open)(comm, filename, amode, info, fh);
    tm2 = darshan_core_wtime();

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    /* use ROMIO approach to strip prefix if present */
    /* strip off prefix if there is one, but only skip prefixes
     * if they are greater than length one to allow for windows
     * drive specifications (e.g. c:\...) 
     */
    tmp = strchr(filename, ':');
    if (tmp > filename + 1) {
        filename = tmp + 1;
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    }

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    MPIIO_PRE_RECORD();
    tmp_fh = *fh;
    MPIIO_RECORD_OPEN(ret, filename, tmp_fh, comm, amode, info, tm1, tm2);
    MPIIO_POST_RECORD();

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    return(ret);
}

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int MPI_File_read(MPI_File fh, void *buf, int count,
    MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read)(fh, buf, count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write(MPI_File fh, const void *buf, int count,
    MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write(MPI_File fh, void *buf, int count,
    MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write)(fh, buf, count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at(MPI_File fh, MPI_Offset offset, const void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_at(MPI_File fh, MPI_Offset offset, void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

int MPI_File_read_all(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_all(MPI_File fh, const void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_all(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

int MPI_File_read_at_all(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
#else
int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

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int MPI_File_read_shared(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_shared)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_shared(MPI_File fh, const void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_shared(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_shared)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

int MPI_File_read_ordered(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_ordered(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, MPI_Status * status)
#else
int MPI_File_write_ordered(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, MPI_Status * status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered)(fh, buf, count,
         datatype, status);
    tm2 = darshan_core_wtime();

509
    MPIIO_PRE_RECORD();
510
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
511 512
    MPIIO_POST_RECORD();

513 514 515 516 517 518 519 520 521 522 523 524
    return(ret);
}

int MPI_File_read_all_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all_begin)(fh, buf, count, datatype);
    tm2 = darshan_core_wtime();

525
    MPIIO_PRE_RECORD();
526
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
527 528
    MPIIO_POST_RECORD();

529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_all_begin(MPI_File fh, const void * buf, int count, MPI_Datatype datatype)
#else
int MPI_File_write_all_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all_begin)(fh, buf, count, datatype);
    tm2 = darshan_core_wtime();

545
    MPIIO_PRE_RECORD();
546
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
547 548
    MPIIO_POST_RECORD();

549 550 551 552 553 554 555 556 557 558 559 560 561 562
    return(ret);
}

int MPI_File_read_at_all_begin(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all_begin)(fh, offset, buf,
        count, datatype);
    tm2 = darshan_core_wtime();
    
563
    MPIIO_PRE_RECORD();
564
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
565 566
    MPIIO_POST_RECORD();

567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype)
#else
int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all_begin)(fh, offset,
        buf, count, datatype);
    tm2 = darshan_core_wtime();

586
    MPIIO_PRE_RECORD();
587
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
588 589
    MPIIO_POST_RECORD();

590 591 592 593 594 595 596 597 598 599 600 601 602
    return(ret);
}

int MPI_File_read_ordered_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered_begin)(fh, buf, count,
        datatype);
    tm2 = darshan_core_wtime();

603
    MPIIO_PRE_RECORD();
604
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
605 606
    MPIIO_POST_RECORD();

607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_ordered_begin(MPI_File fh, const void * buf, int count, MPI_Datatype datatype)
#else
int MPI_File_write_ordered_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered_begin)(fh, buf, count,
        datatype);
    tm2 = darshan_core_wtime();

624
    MPIIO_PRE_RECORD();
625
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
626 627
    MPIIO_POST_RECORD();

628 629 630 631 632 633 634 635 636 637 638 639
    return(ret);
}

int MPI_File_iread(MPI_File fh, void * buf, int count, MPI_Datatype datatype, __D_MPI_REQUEST * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread)(fh, buf, count, datatype, request);
    tm2 = darshan_core_wtime();

640
    MPIIO_PRE_RECORD();
641
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
642 643
    MPIIO_POST_RECORD();

644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#else
int MPI_File_iwrite(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite)(fh, buf, count, datatype, request);
    tm2 = darshan_core_wtime();

662
    MPIIO_PRE_RECORD();
663
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
664 665
    MPIIO_POST_RECORD();

666 667 668 669 670 671 672 673 674 675 676 677 678 679
    return(ret);
}

int MPI_File_iread_at(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, __D_MPI_REQUEST *request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_at)(fh, offset, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

680
    MPIIO_PRE_RECORD();
681
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
682 683
    MPIIO_POST_RECORD();

684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype, __D_MPI_REQUEST *request)
#else
int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, __D_MPI_REQUEST *request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_at)(fh, offset, buf,
        count, datatype, request);
    tm2 = darshan_core_wtime();

703
    MPIIO_PRE_RECORD();
704
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
705 706
    MPIIO_POST_RECORD();

707 708 709 710 711 712 713 714 715 716 717 718 719 720
    return(ret);
}

int MPI_File_iread_shared(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_shared)(fh, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

721
    MPIIO_PRE_RECORD();
722
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
723 724
    MPIIO_POST_RECORD();

725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite_shared(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#else
int MPI_File_iwrite_shared(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_shared)(fh, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

744
    MPIIO_PRE_RECORD();
745
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
746 747
    MPIIO_POST_RECORD();

748 749
    return(ret);
}
750 751 752 753

int MPI_File_sync(MPI_File fh)
{
    int ret;
754
    struct mpiio_file_record_ref *rec_ref;
755 756 757 758 759 760 761 762
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_sync)(fh);
    tm2 = darshan_core_wtime();

    if(ret == MPI_SUCCESS)
    {
763 764 765 766
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
767
        {
768
            rec_ref->file_rec->counters[MPIIO_SYNCS] += 1;
769
            DARSHAN_TIMER_INC_NO_OVERLAP(
770 771
                rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME],
                tm1, tm2, rec_ref->last_write_end);
772
        }
773
        MPIIO_POST_RECORD();
774 775 776 777 778 779 780 781 782 783 784 785 786 787
    }

    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
    MPI_Datatype filetype, const char *datarep, MPI_Info info)
#else
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
    MPI_Datatype filetype, char *datarep, MPI_Info info)
#endif
{
    int ret;
788
    struct mpiio_file_record_ref *rec_ref;
789 790 791 792 793 794 795 796 797
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_set_view)(fh, disp, etype, filetype,
        datarep, info);
    tm2 = darshan_core_wtime();

    if(ret == MPI_SUCCESS)
    {
798 799 800 801
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
802
        {
803
            rec_ref->file_rec->counters[MPIIO_VIEWS] += 1;
804 805
            if(info != MPI_INFO_NULL)
            {
806
                rec_ref->file_rec->counters[MPIIO_HINTS] += 1;
807
                DARSHAN_TIMER_INC_NO_OVERLAP(
808 809
                    rec_ref->file_rec->fcounters[MPIIO_F_META_TIME],
                    tm1, tm2, rec_ref->last_meta_end);
810 811
           }
        }
812
        MPIIO_POST_RECORD();
813 814 815 816 817
    }

    return(ret);
}

818 819 820
int MPI_File_close(MPI_File *fh)
{
    int ret;
821
    struct mpiio_file_record_ref *rec_ref;
822
    MPI_File tmp_fh = *fh;
823 824 825 826 827 828
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_close)(fh);
    tm2 = darshan_core_wtime();

829 830 831 832
    MPIIO_PRE_RECORD();
    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
        &tmp_fh, sizeof(MPI_File));
    if(rec_ref)
833
    {
834
        rec_ref->file_rec->fcounters[MPIIO_F_CLOSE_TIMESTAMP] =
835 836
            darshan_core_wtime();
        DARSHAN_TIMER_INC_NO_OVERLAP(
837 838 839 840
            rec_ref->file_rec->fcounters[MPIIO_F_META_TIME],
            tm1, tm2, rec_ref->last_meta_end);
        darshan_delete_record_ref(&(mpiio_runtime->fh_hash),
            &tmp_fh, sizeof(MPI_File));
841
    }
842
    MPIIO_POST_RECORD();
843 844 845 846 847 848 849 850 851

    return(ret);
}

/***********************************************************
 * Internal functions for manipulating MPI-IO module state *
 ***********************************************************/

/* initialize data structures and register with darshan-core component */
852 853
static void mpiio_runtime_initialize()
{
854
    int mpiio_buf_size;
855

856 857 858
    /* try and store the default number of records for this module */
    mpiio_buf_size = DARSHAN_DEF_MOD_REC_COUNT * sizeof(struct darshan_mpiio_file);

859 860 861
    /* register the mpiio module with darshan core */
    darshan_core_register_module(
        DARSHAN_MPIIO_MOD,
862
        &mpiio_shutdown,
863
        &mpiio_buf_size,
864
        &my_rank,
865
        NULL);
866

867 868
    /* return if darshan-core does not provide enough module memory */
    if(mpiio_buf_size < sizeof(struct darshan_mpiio_file))
869 870
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
871
        return;
872
    }
873 874 875

    mpiio_runtime = malloc(sizeof(*mpiio_runtime));
    if(!mpiio_runtime)
876 877
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
878
        return;
879
    }
880 881 882 883 884
    memset(mpiio_runtime, 0, sizeof(*mpiio_runtime));

    return;
}

885 886
static struct mpiio_file_record_ref *mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path)
887
{
888 889
    struct darshan_mpiio_file *file_rec = NULL;
    struct mpiio_file_record_ref *rec_ref = NULL;
890
    int ret;
891

892 893
    rec_ref = malloc(sizeof(*rec_ref));
    if(!rec_ref)
894
        return(NULL);
895
    memset(rec_ref, 0, sizeof(*rec_ref));
896

897 898 899 900
    /* add a reference to this file record based on record id */
    ret = darshan_add_record_ref(&(mpiio_runtime->rec_id_hash), &rec_id,
        sizeof(darshan_record_id), rec_ref);
    if(ret == 0)
901
    {
902
        free(rec_ref);
903 904 905
        return(NULL);
    }

906 907
    /* register the actual file record with darshan-core so it is persisted
     * in the log file
908
     */
909 910 911 912 913 914
    file_rec = darshan_core_register_record(
        rec_id,
        path,
        DARSHAN_MPIIO_MOD,
        sizeof(struct darshan_mpiio_file),
        NULL);
915

916
    if(!file_rec)
917
    {
918 919 920 921
        darshan_delete_record_ref(&(mpiio_runtime->rec_id_hash),
            &rec_id, sizeof(darshan_record_id));
        free(rec_ref);
        return(NULL);
922 923
    }

924 925 926 927 928 929 930
    /* registering this file record was successful, so initialize some fields */
    file_rec->base_rec.id = rec_id;
    file_rec->base_rec.rank = my_rank;
    rec_ref->file_rec = file_rec;
    mpiio_runtime->file_rec_count++;

    return(rec_ref);
931 932
}

933 934 935 936 937 938 939 940 941
static void mpiio_finalize_file_records(void *rec_ref_p)
{
    struct mpiio_file_record_ref *rec_ref =
        (struct mpiio_file_record_ref *)rec_ref_p;

    tdestroy(rec_ref->access_root, free);
    return;
}

942 943 944 945 946
static void mpiio_record_reduction_op(
    void* infile_v,
    void* inoutfile_v,
    int *len,
    MPI_Datatype *datatype)
947
{
948 949 950
    struct darshan_mpiio_file tmp_file;
    struct darshan_mpiio_file *infile = infile_v;
    struct darshan_mpiio_file *inoutfile = inoutfile_v;
951
    int i, j, k;
952

953 954 955
    for(i=0; i<*len; i++)
    {
        memset(&tmp_file, 0, sizeof(struct darshan_mpiio_file));
956 957
        tmp_file.base_rec.id = infile->base_rec.id;
        tmp_file.base_rec.rank = -1;
958 959

        /* sum */
960 961 962 963 964 965 966 967 968
        for(j=MPIIO_INDEP_OPENS; j<=MPIIO_VIEWS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

        tmp_file.counters[MPIIO_MODE] = infile->counters[MPIIO_MODE];

        /* sum */
        for(j=MPIIO_BYTES_READ; j<=MPIIO_RW_SWITCHES; j++)
969 970 971 972
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
        /* skip MPIIO_MAX_*_TIME_SIZE; handled in floating point section */

        for(j=MPIIO_SIZE_READ_AGG_0_100; j<=MPIIO_SIZE_WRITE_AGG_1G_PLUS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

        /* first collapse any duplicates */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
        {
            for(k=MPIIO_ACCESS1_ACCESS; k<=MPIIO_ACCESS4_ACCESS; k++)
            {
                if(infile->counters[j] == inoutfile->counters[k])
                {
                    infile->counters[j+4] += inoutfile->counters[k+4];
                    inoutfile->counters[k] = 0;
                    inoutfile->counters[k+4] = 0;
                }
            }
        }

        /* first set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
        {
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), infile->counters[j],
999
                infile->counters[j+4], 0);
1000 1001 1002 1003
        }

        /* second set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
1004
        {
1005 1006
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), inoutfile->counters[j],
1007
                inoutfile->counters[j+4], 0);
1008 1009 1010
        }

        /* min non-zero (if available) value */
1011
        for(j=MPIIO_F_OPEN_TIMESTAMP; j<=MPIIO_F_WRITE_START_TIMESTAMP; j++)
1012
        {
1013 1014
            if((infile->fcounters[j] < inoutfile->fcounters[j] &&
               infile->fcounters[j] > 0) || inoutfile->fcounters[j] == 0)
1015
                tmp_file.fcounters[j] = infile->fcounters[j];
1016 1017
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
1018 1019
        }

1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
        /* max */
        for(j=MPIIO_F_READ_END_TIMESTAMP; j<= MPIIO_F_CLOSE_TIMESTAMP; j++)
        {
            if(infile->fcounters[j] > inoutfile->fcounters[j])
                tmp_file.fcounters[j] = infile->fcounters[j];
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
        }

        /* sum */
        for(j=MPIIO_F_READ_TIME; j<=MPIIO_F_META_TIME; j++)
        {
1032
            tmp_file.fcounters[j] = infile->fcounters[j] + inoutfile->fcounters[j];
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
        }

        /* max (special case) */
        if(infile->fcounters[MPIIO_F_MAX_READ_TIME] >
            inoutfile->fcounters[MPIIO_F_MAX_READ_TIME])
        {
            tmp_file.fcounters[MPIIO_F_MAX_READ_TIME] =
                infile->fcounters[MPIIO_F_MAX_READ_TIME];
            tmp_file.counters[MPIIO_MAX_READ_TIME_SIZE] =
                infile->counters[MPIIO_MAX_READ_TIME_SIZE];
        }
        else
        {
            tmp_file.fcounters[MPIIO_F_MAX_READ_TIME] =
                inoutfile->fcounters[MPIIO_F_MAX_READ_TIME];
            tmp_file.counters[MPIIO_MAX_READ_TIME_SIZE] =
                inoutfile->counters[MPIIO_MAX_READ_TIME_SIZE];
        }

        if(infile->fcounters[MPIIO_F_MAX_WRITE_TIME] >
            inoutfile->fcounters[MPIIO_F_MAX_WRITE_TIME])
        {
            tmp_file.fcounters[MPIIO_F_MAX_WRITE_TIME] =
                infile->fcounters[MPIIO_F_MAX_WRITE_TIME];
            tmp_file.counters[MPIIO_MAX_WRITE_TIME_SIZE] =
                infile->counters[MPIIO_MAX_WRITE_TIME_SIZE];
        }
        else
        {
            tmp_file.fcounters[MPIIO_F_MAX_WRITE_TIME] =
                inoutfile->fcounters[MPIIO_F_MAX_WRITE_TIME];
            tmp_file.counters[MPIIO_MAX_WRITE_TIME_SIZE] =
                inoutfile->counters[MPIIO_MAX_WRITE_TIME_SIZE];
        }

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        /* min (zeroes are ok here; some procs don't do I/O) */
        if(infile->fcounters[MPIIO_F_FASTEST_RANK_TIME] <
            inoutfile->fcounters[MPIIO_F_FASTEST_RANK_TIME])
        {
            tmp_file.counters[MPIIO_FASTEST_RANK] =
                infile->counters[MPIIO_FASTEST_RANK];
            tmp_file.counters[MPIIO_FASTEST_RANK_BYTES] =
                infile->counters[MPIIO_FASTEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_FASTEST_RANK_TIME] =
                infile->fcounters[MPIIO_F_FASTEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[MPIIO_FASTEST_RANK] =
                inoutfile->counters[MPIIO_FASTEST_RANK];
            tmp_file.counters[MPIIO_FASTEST_RANK_BYTES] =
                inoutfile->counters[MPIIO_FASTEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_FASTEST_RANK_TIME] =
                inoutfile->fcounters[MPIIO_F_FASTEST_RANK_TIME];
        }

        /* max */
        if(infile->fcounters[MPIIO_F_SLOWEST_RANK_TIME] >
           inoutfile->fcounters[MPIIO_F_SLOWEST_RANK_TIME])
        {
            tmp_file.counters[MPIIO_SLOWEST_RANK] =
                infile->counters[MPIIO_SLOWEST_RANK];
            tmp_file.counters[MPIIO_SLOWEST_RANK_BYTES] =
                infile->counters[MPIIO_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                infile->fcounters[MPIIO_F_SLOWEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[MPIIO_SLOWEST_RANK] =
                inoutfile->counters[MPIIO_SLOWEST_RANK];
            tmp_file.counters[MPIIO_SLOWEST_RANK_BYTES] =
                inoutfile->counters[MPIIO_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                inoutfile->fcounters[MPIIO_F_SLOWEST_RANK_TIME];
        }

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        /* update pointers */
        *inoutfile = tmp_file;
        inoutfile++;
        infile++;
    }

    return;
}

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static void mpiio_shared_record_variance(MPI_Comm mod_comm,
    struct darshan_mpiio_file *inrec_array, struct darshan_mpiio_file *outrec_array,
    int shared_rec_count)
{
    MPI_Datatype var_dt;
    MPI_Op var_op;
    int i;
    struct darshan_variance_dt *var_send_buf = NULL;
    struct darshan_variance_dt *var_recv_buf = NULL;

    DARSHAN_MPI_CALL(PMPI_Type_contiguous)(sizeof(struct darshan_variance_dt),
        MPI_BYTE, &var_dt);
    DARSHAN_MPI_CALL(PMPI_Type_commit)(&var_dt);

    DARSHAN_MPI_CALL(PMPI_Op_create)(darshan_variance_reduce, 1, &var_op);

    var_send_buf = malloc(shared_rec_count * sizeof(struct darshan_variance_dt));
    if(!var_send_buf)
        return;

    if(my_rank == 0)
    {
        var_recv_buf = malloc(shared_rec_count * sizeof(struct darshan_variance_dt));

        if(!var_recv_buf)
            return;
    }

    /* get total i/o time variances for shared records */

    for(i=0; i<shared_rec_count; i++)
    {
        var_send_buf[i].n = 1;
        var_send_buf[i].S = 0;
        var_send_buf[i].T = inrec_array[i].fcounters[MPIIO_F_READ_TIME] +
                            inrec_array[i].fcounters[MPIIO_F_WRITE_TIME] +
                            inrec_array[i].fcounters[MPIIO_F_META_TIME];
    }

    DARSHAN_MPI_CALL(PMPI_Reduce)(var_send_buf, var_recv_buf, shared_rec_count,
        var_dt, var_op, 0, mod_comm);

    if(my_rank == 0)
    {
        for(i=0; i<shared_rec_count; i++)
        {
            outrec_array[i].fcounters[MPIIO_F_VARIANCE_RANK_TIME] =
                (var_recv_buf[i].S / var_recv_buf[i].n);
        }
    }

    /* get total bytes moved variances for shared records */

    for(i=0; i<shared_rec_count; i++)
    {
        var_send_buf[i].n = 1;
        var_send_buf[i].S = 0;
        var_send_buf[i].T = (double)
                            inrec_array[i].counters[MPIIO_BYTES_READ] +
                            inrec_array[i].counters[MPIIO_BYTES_WRITTEN];
    }

    DARSHAN_MPI_CALL(PMPI_Reduce)(var_send_buf, var_recv_buf, shared_rec_count,
        var_dt, var_op, 0, mod_comm);

    if(my_rank == 0)
    {
        for(i=0; i<shared_rec_count; i++)
        {
            outrec_array[i].fcounters[MPIIO_F_VARIANCE_RANK_BYTES] =
                (var_recv_buf[i].S / var_recv_buf[i].n);
        }
    }

    DARSHAN_MPI_CALL(PMPI_Type_free)(&var_dt);
    DARSHAN_MPI_CALL(PMPI_Op_free)(&var_op);
    free(var_send_buf);
    free(var_recv_buf);

    return;
}

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static void mpiio_cleanup_runtime()
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{
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    darshan_clear_record_refs(&(mpiio_runtime->fh_hash), 0);
    darshan_clear_record_refs(&(mpiio_runtime->rec_id_hash), 1);
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    free(mpiio_runtime);
    mpiio_runtime = NULL;
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    instrumentation_disabled = 0;
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    return;
}

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/* mpiio module shutdown benchmark routine */
void darshan_mpiio_shutdown_bench_setup(int test_case)
{
    char filepath[256];
    MPI_File *fh_array;
    int64_t *size_array;
    int i;
    intptr_t j;

    if(mpiio_runtime)
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        mpiio_cleanup_runtime();
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    mpiio_runtime_initialize();

    srand(my_rank);
    fh_array = malloc(1024 * sizeof(MPI_File));
    size_array = malloc(DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT * sizeof(int64_t));
    assert(fh_array && size_array);

    for(j = 0; j < 1024; j++)
        fh_array[j] = (MPI_File)j;
    for(i = 0; i < DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT; i++)
        size_array[i] = rand();

    switch(test_case)
    {
        case 1: /* single file-per-process */
            snprintf(filepath, 256, "fpp-0_rank-%d", my_rank);

            MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[0], MPI_COMM_SELF,
                2, MPI_INFO_NULL, 0, 1);
            MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[0], size_array[0], MPI_BYTE,
                MPIIO_INDEP_WRITES, 1, 2);

            break;
        case 2: /* single shared file */
            snprintf(filepath, 256, "shared-0");

            MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[0], MPI_COMM_WORLD,
                2, MPI_INFO_NULL, 0, 1);
            MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[0], size_array[0], MPI_BYTE,
                MPIIO_COLL_WRITES, 1, 2);

            break;
        case 3: /* 1024 unique files per proc */
            for(i = 0; i < 1024; i++)
            {
                snprintf(filepath, 256, "fpp-%d_rank-%d", i , my_rank);

                MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[i], MPI_COMM_SELF,
                    2, MPI_INFO_NULL, 0, 1);
                MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[i],
                    size_array[i % DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT],
                    MPI_BYTE, MPIIO_INDEP_WRITES, 1, 2);
            }

            break;
        case 4: /* 1024 shared files per proc */
            for(i = 0; i < 1024; i++)
            {
                snprintf(filepath, 256, "shared-%d", i);

                MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[i], MPI_COMM_WORLD,
                    2, MPI_INFO_NULL, 0, 1);
                MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[i],
                    size_array[i % DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT],
                    MPI_BYTE, MPIIO_COLL_WRITES, 1, 2);
            }
            break;
        default:
            fprintf(stderr, "Error: invalid Darshan benchmark test case.\n");
            return;
    }

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    free(fh_array);
    free(size_array);

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    return;
}

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/********************************************************************************
 * shutdown function exported by this module for coordinating with darshan-core *
 ********************************************************************************/
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static void mpiio_shutdown(
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    MPI_Comm mod_comm,
    darshan_record_id *shared_recs,
    int shared_rec_count,
    void **mpiio_buf,
    int *mpiio_buf_sz)
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{
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    struct mpiio_file_record_ref *rec_ref;
    struct darshan_mpiio_file *mpiio_rec_buf = *(struct darshan_mpiio_file **)mpiio_buf;
    int mpiio_rec_count;
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    double mpiio_time;
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    struct darshan_mpiio_file *red_send_buf = NULL;
    struct darshan_mpiio_file *red_recv_buf = NULL;
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    MPI_Datatype red_type;
    MPI_Op red_op;
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    int i;
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    MPIIO_LOCK();
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    assert(mpiio_runtime);
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    /* disable further instrumentation while we shutdown */
    instrumentation_disabled = 1;

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    mpiio_rec_count = mpiio_runtime->file_rec_count;
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    /* perform any final transformations on MPIIO file records before
     * writing them out to log file
     */
    darshan_iter_record_refs(mpiio_runtime->rec_id_hash, &mpiio_finalize_file_records);
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    /* if there are globally shared files, do a shared file reduction */
    /* NOTE: the shared file reduction is also skipped if the 
     * DARSHAN_DISABLE_SHARED_REDUCTION environment variable is set.
     */
    if(shared_rec_count && !getenv("DARSHAN_DISABLE_SHARED_REDUCTION"))
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    {
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        /* necessary initialization of shared records */
        for(i = 0; i < shared_rec_count; i++)
        {
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            rec_ref = darshan_lookup_record_ref(mpiio_runtime->rec_id_hash,
                &shared_recs[i], sizeof(darshan_record_id));
            assert(rec_ref);
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            mpiio_time =
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                rec_ref->file_rec->fcounters[MPIIO_F_READ_TIME] +
                rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME] +
                rec_ref->file_rec->fcounters[MPIIO_F_META_TIME];
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            /* initialize fastest/slowest info prior to the reduction */
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            rec_ref->file_rec->counters[MPIIO_FASTEST_RANK] =
                rec_ref->file_rec->base_rec.rank;
            rec_ref->file_rec->counters[MPIIO_FASTEST_RANK_BYTES] =
                rec_ref->file_rec->counters[MPIIO_BYTES_READ] +
                rec_ref->file_rec->counters[MPIIO_BYTES_WRITTEN];
            rec_ref->file_rec->fcounters[MPIIO_F_FASTEST_RANK_TIME] =
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                mpiio_time;

            /* until reduction occurs, we assume that this rank is both
             * the fastest and slowest. It is up to the reduction operator
             * to find the true min and max.
             */
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            rec_ref->file_rec->counters[MPIIO_SLOWEST_RANK] =
                rec_ref->file_rec->counters[MPIIO_FASTEST_RANK];
            rec_ref->file_rec->counters[MPIIO_SLOWEST_RANK_BYTES] =
                rec_ref->file_rec->counters[MPIIO_FASTEST_RANK_BYTES];
            rec_ref->file_rec->fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                rec_ref->file_rec->fcounters[MPIIO_F_FASTEST_RANK_TIME];

            rec_ref->file_rec->base_rec.rank = -1;
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        }

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        /* sort the array of records so we get all of the shared records
         * (marked by rank -1) in a contiguous portion at end of the array
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         */
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        darshan_record_sort(mpiio_rec_buf, mpiio_rec_count,
            sizeof(struct darshan_mpiio_file));
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        /* make send_buf point to the shared files at the end of sorted array */
        red_send_buf = &(mpiio_rec_buf[mpiio_rec_count-shared_rec_count]);
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        /* allocate memory for the reduction output on rank 0 */
        if(my_rank == 0)
        {
            red_recv_buf = malloc(shared_rec_count * sizeof(struct darshan_mpiio_file));
            if(!red_recv_buf)
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            {
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                MPIIO_UNLOCK();
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                return;
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            }
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        }

        /* construct a datatype for a MPIIO file record.  This is serving no purpose
         * except to make sure we can do a reduction on proper boundaries
         */
        DARSHAN_MPI_CALL(PMPI_Type_contiguous)(sizeof(struct darshan_mpiio_file),
            MPI_BYTE, &red_type);
        DARSHAN_MPI_CALL(PMPI_Type_commit)(&red_type);

        /* register a MPIIO file record reduction operator */
        DARSHAN_MPI_CALL(PMPI_Op_create)(mpiio_record_reduction_op, 1, &red_op);

        /* reduce shared MPIIO file records */
        DARSHAN_MPI_CALL(PMPI_Reduce)(red_send_buf, red_recv_buf,
            shared_rec_count, red_type, red_op, 0, mod_comm);

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        /* get the time and byte variances for shared files */
        mpiio_shared_record_variance(mod_comm, red_send_buf, red_recv_buf,
            shared_rec_count);

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        /* clean up reduction state */
        if(my_rank == 0)
        {
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            int tmp_ndx = mpiio_rec_count - shared_rec_count;
            memcpy(&(mpiio_rec_buf[tmp_ndx]), red_recv_buf,
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                shared_rec_count * sizeof(struct darshan_mpiio_file));
            free(red_recv_buf);
        }
        else
        {
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            mpiio_rec_count -= shared_rec_count;
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        }

        DARSHAN_MPI_CALL(PMPI_Type_free)(&red_type);
        DARSHAN_MPI_CALL(PMPI_Op_free)(&red_op);
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    }

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    *mpiio_buf_sz = mpiio_rec_count * sizeof(struct darshan_mpiio_file);
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    /* shutdown internal structures used for instrumenting */
    mpiio_cleanup_runtime();
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    MPIIO_UNLOCK();
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    return;
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}

Philip Carns's avatar
Philip Carns committed
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/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */